I can remember when liners were pulled and we used to put Pistons up in a lathe, machine out the ring slots oversize and have " seasoned" close grain blank cast iron rings supplied which were machined out by us to fit the new piston ring slots ie oversize. Spare rings would be made up and put on the ship. Down to the ship, the rings would be gapped in the bore, sometimes for the smaller liners glaze busters would be used if it was deemed not necessary to fit new liners. ( which was virtually never ). Some of the Pistons were quite big in diameter and the trick you were taught was never to take too big a cut because if the piston took charge and leapt out of the chuck/ faceplate be the first out of the door. We used to make up and shrink wear rings on shafts etc, I remember being taught how to heat and press on ring gears and how one day an apprentice shrunk his on the wrong way round, had to be ground then split with a chisel off, scrap. I too never found a ( like for " like" ) situation ever work out, " oh don't worry, this one goes straight in " It never did for me. Loads of pipe work changes, different hand, special elbows to be made up etc. etc. etc. Ball Ache Jobs. " oh, what took you so long? Why can't we test run it ? What's gone wrong remarks were bandied around . Seeing this sort of job looming people would drag out other jobs or volunteer for some job they would not normally wish to undertake. Talking about jobs leaping out of chucks / machine vices etc the boy for that was without doubt the Shaper Machine. He really was a beast. Not too bad for keyways etc in brass but Monel metal, stainless and the like very small cuts indeed or the job could be found 40 feet away from the machine and any passers by stood a good chance of losing a leg or two. Scary boy he was. Lots of tools hardly used now, thread gauges, thread files, reamers, inside/ outside caliphers BSF BSW spanners fox wedges ( remember them anyone? ) special chisels for getting feather/woodruff and Gibkeys ( they were the worst ones to get out of a coupling on a shaft.) Scribing blocks, two start taps, left hand taps, used to be able to file flat but all you seem to do with a file now is deburring jobs. Just remembered another scary tool which I haven't used since 1970 's a knurling tool. All sorts of dodges used to go on here in the machine shops, keyways cut too big, peened over, making up liners/ sleeves etc, taking the final cut too big, out with the centre punch, in he went as an interference fit. I remember seeing my first spring loaded centre punch, he would do ten by the time your manual one had done two, ideal when the works foreman was around. Happy days indeed then methinks.
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.